Android 各控件的使用 - 单选框(RadioButton)

安卓单选框的使用

依然是Lesson项目，项目截图就不贴了。想知道的，看上一篇

依旧是添加个Activity，src文件夹下添加一个RadioButtonActivity

 

package cn.Kurodo;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.Toast;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class RadioButtonActivity extends Activity {
    
    public RadioButtonActivity(){
        
    }

    private RadioGroup m_radioGroup;
    private RadioButton    m_radioBtn;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.radiobutton);
        
        m_radioGroup = (RadioGroup)findViewById(R.id.selectGroup);
        m_radioBtn = (RadioButton)findViewById(R.id.bothnot);
        
    //设置事件监听
    m_radioGroup.setOnCheckedChangeListener(new RadioGroupListener());
    }
    
        //显示个浮动消息框
    protected void displayMessage(String msg)
    {
        Toast message = Toast.makeText(this, msg, Toast.LENGTH_LONG);
        message.setGravity(Gravity.BOTTOM, 0, 200);
        message.show();
    }
    
        //内部类
    class RadioGroupListener implements OnCheckedChangeListener {

        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            if(checkedId == m_radioBtn.getId())
            {
                displayMessage("正确答案：" + m_radioBtn.getText() + "，恭喜你，回答正确！");
            }
            else
            {
                displayMessage("回答错误！");
            }
        }
    }
}

 

radiobutton的布局文件

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <TextView android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:text="@string/radio_title"
        />
    <RadioGroup android:id="@+id/selectGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <RadioButton 
            android:id="@+id/chunge"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/chunge"
        />
        <RadioButton 
            android:id="@+id/zengge"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/zengge"
        />
        <RadioButton 
            android:id="@+id/bothnot"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/bothnot"
        />
    </RadioGroup>
</LinearLayout>

 

依旧是修改启动Activity为这次的RadioButtonActivity，这里就不贴码了。

运行效果